The first statement is incorrect as April rainfall exceeds March rainfall in all the locations.
The second statement is the only one that is correct as peak rainfall occurs in April only in locations $6$ and $7$.
The third statement is incorrect as November rainfall is lower than March rainfall in location $7$ only and not in location $6$.
The fourth statement is incorrect as April rainfall is less than $200 \; \text{cm}$ in locations $1, 2$ and $3$ as well.
Hence, option $(2)$. Peak rainfall occurs in April.